The Library
Precision metrology using weak measurements
Tools
Tools
Tools
Zhang, Lijian, Datta, Animesh and Walmsley, Ian A. (2015) Precision metrology using weak measurements. Physical Review Letters, 114 (21). 210801 . doi:10.1103/PhysRevLett.114.210801 ISSN 0031-9007.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1103/PhysRevLett.114.210801
Abstract
Weak values and measurements have been proposed as a means to achieve dramatic enhancements in metrology based on the greatly increased range of possible measurement outcomes. Unfortunately, the very large values of measurement outcomes occur with highly suppressed probabilities. This raises three vital questions in weak-measurement-based metrology. Namely, (Q1) Does postselection enhance the measurement precision? (Q2) Does weak measurement offer better precision than strong measurement? (Q3) Is it possible to beat the standard quantum limit or to achieve the Heisenberg limit with weak measurement using only classical resources? We analyze these questions for two prototypical, and generic, measurement protocols and show that while the answers to the first two questions are negative for both protocols, the answer to the last is affirmative for measurements with phase-space interactions, and negative for configuration space interactions. Our results, particularly the ability of weak measurements to perform at par with strong measurements in some cases, are instructive for the design of weak-measurement-based protocols for quantum metrology.
| Item Type: | Journal Article | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||
| Journal or Publication Title: | Physical Review Letters | ||||||||||||||||||||||||
| Publisher: | American Physical Society | ||||||||||||||||||||||||
| ISSN: | 0031-9007 | ||||||||||||||||||||||||
| Official Date: | 29 May 2015 | ||||||||||||||||||||||||
| Dates: |
|
||||||||||||||||||||||||
| Volume: | 114 | ||||||||||||||||||||||||
| Number: | 21 | ||||||||||||||||||||||||
| Article Number: | 210801 | ||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevLett.114.210801 | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
